Controlling means for valves.



PATENTED MAR. 12, 1907. S. A. PARSONS & J. T-URNBULL. CONTROLLING MEANSFOR VALVES.

APPLIOATION FILED JUNE 9. 1905.

2 snnnTs-sazm 1 No. 846,692. 7 PATBNTED MAR. 12, 190.7. 0. A. PAR$ONS &J. TURNBULL.

CONTROLLING MEANS FOR VALVES.

APPLIOATION PILBD war: 9, 1900.

2 snnnrrsqnnr 2 r i v lfcvemz or mamzfw a \7 England, and TurbiniaWorks, Wallsend- UNITED STATES VPATENT OFFICE.

CHARLES ALGERNON PARSONS, OF i IEWCASTLE-UPON-TYNE, AND JOHN TURNBULL,OF WALLSEND, ENGLAND; SAID TURNBULL ASSIGNOR TO "SAID/PARSONS.

To all whom it may OOH/(3677b:

PARSONS and Jens TL'RNBL'LL, subjects of the King of Great Britain andlreland, residing at-lieaton Works, hewcastleupon-'lync,

upon-Tyne, England, respectively, have invented new and usefulImprovements in and Relating to Controlling Means for Valves, of

which the following is a specification.

The invention relates toimprovements in controlling means forlargelift-valves, and is specially applicable to marine steam-turbinedisposed in the piping which connects the exhaust end of one turbinewith the inlet end of another. The invention may also be applied inother cases where it is desirable that a nonreturnvalve connectionshould sometimes act as a stop-valve and close against pressure.

The object of the invention is to close such valves quickly and'readilyagainst pressure. The invention consists" in a non return valve'havingacontrolling-motor adapted to close thevalve againstpressure readily andqu ckly when required.

The invention further consists in providing a valve of this type withclamping means, whereby the valve may be held shut against thesteam-pressuretending to open it, and various other details, ashereinafter described.

.Such motor-controlled valves may with advantage be used in any casewhere a combination of non-return and stop valves are employedas, forinstance, .'n any fluid-distribution system, especially. where two ormore pressures of fluid are used ,--o1 in the case where the steam-pipefrom two bati cries of boilers unite. in this latter case thi: form ofvalve would be especially useful when anything occurred to stop thewhole of one battery. The invention is also useful in marine or othersteam-turbine plants having a turbine on one shaft connected by pipingwith turbines on other shafts in order that the connection orconnections between certain of the turbines different speed.

Referring now to the accompanying drawings,- which form part of ourspecification,

Figure 1, is aside elevation showing the improved'valve monaterm; .E g.2 IS'B. -sec Specification of Letters Patent. Application filed June9,1905. Serial No- 264,481.

-CON TR OLL|NG MEANS FOR VALVES..

:' tented March 12, 1907.

tional elevation of the valve shown in Fig. 1. Fig. 3 is a section onthe line A B of Fig. 1, and Fig. 4 is a sect-ion on the line CI) of Fig.1.

in carrying the invention into effect according to one form asillustrated in the acl companying drawings a non-return valve b isdisposed within a casing wand adapted when in the closed position tomake a fluidtight joint with a seating c. Passing through. the center ofthe valve there is a guide-spindle d, which is a working fit in. theguide 2 and stu'liing-gland 3 and is provided with two collars 4 4,between whichthere works the installations in which non-return valvesare pivoted lever 5. A spring 6, adapted to hold the valve b resilientlyto its seat, is provided at the extremity of the pivoted lever.Concentrically with the guide-spindle of there is a ring e, carried bytwo rods f,'which pass out through glands in the cover eand areconnected by across-head g attheir outer extremities. This cross-head g(see Fig. 4) is provided with a slipper 8, adapted to slide in a guidet, and at its center is connected, by means of a red It, to a piston j,arranged to work in a cylinder '8. Steam or other m'otive iluidniay besupplied to the cylinder through 86 the pipes 7 and S. With thisapparatus if steam be supplied through the pipe 8 the pis- 'ton j willbe moved forward, so as to brin the ring e to bear against the valve 5an hold it against its seating c. The area of the piston j is such thatwith the available pres sure of operating fluid it shall be able toclose the non-return valve and hold it shut against the steampressure'tendin to 0 en it.

If it is desired to hold t 1e va l ve shut as, 90 for instance, when aturbine is to be shut down for some ti nenuts y, gearing with screws won long studs r, are tightened up, so as to rigidly hold the ring einits lowest position.

in order to prevent the motor 1'. from moving the valve too quicklyagainst its face, and thereby. causing damage, we provide a dash-potcylinder m, arranged coaxially' wit-h the motor-cylinder i. In thiscylinder :00 there works a piston-h, connected by an extension of therod 15 to the motor-piston 7', while oil 'orothcr fluid is provided'toassist the cushioning eii'ect. Thus when the piston I 1' moves forwardthe piston h is also drawn r05 forward, thus forcing the oil or otherfluid contained in the front of thecylinder or throughsuitably-proportioned openings p and 0 and a passage'q to the back endof the cylinder m. It will be seen that as the piston h ap roaches theend of its stroke it covers the iioles 0, thus reducing the area of oilpassage from the front to the rear end of the cylinder m, and therebyincreasing the re- SISiJHJICEQfi GIGd by the oil to the movement of themotor.

. The sizes of the holes 0 and 1) should be such as to provide thenecessary cushioning for the motor h.

A suitable cock an is rovided on the pipe 1 connecting the two end; ofthe cylinder 11:, for the purpose of filling the cylinder with oil orallowing entrapped air to escape: A handle 2 may also be provided on thevalve-spindle (l for the purpose of turning the valve 1) round, so as toprevent uneven wear of the seating, as will be readily understood.

Thisform of valve may be used in turbine installations having threeshafts with a highpressure turbine on the center one and a lowpressureturbine on each side shaft, the steam from the high-pressure turbinebeing divided between the two low-pressure turbines. Our non-returnvalves are placed in the connections'between the high and two lowpressure turbines. In cases of emergency we are thereby enabled toforcibly close quickly either of the valves, so as to close theconnection between the high-pressure and one of the low-pressureturbines to enable thehighpressure and the other'low-pressure turbine tobe worked ahead, while the disconnected low-pressure turbine is beingworked astern by means of the usual maneuvering-valves, whichindependently admit steam to the re versing-turbinc or to the inlet ofthe lowpressure turbine. Our invention maybe applied to otherarrangements of turbines where non-return valves are used, such betweenthe exhausts of cruising turbines and the main turbines or between theexhau'sts of one cruising turbine (or high-pressure turbine) andsteam-passage of another cruising turbine, (or intermediate-pressurecruising turbine,) into which the first cruising turbine (orhigh-pressure cruising tur- I bine) exhausts, and then betweenthe'second cruising-turbine (or llltCIIIl(l(l18.lIC-]')IQSSUIQ(-ruising-turbine) exhaust and ma n turbines.

It will be readily seen, "however, that this I and adapted to close saidnon-return valve 'botlrcapablc of independent motion, a dashpot arrangedto retard the, action of the controlling-motor, substantially asdescribed.

2 In combination, a non-return valve, a fluid-pressure motor, across-head adapted to be rcciprocated by said motor, rods attached tosaid cross-head, and passing fluid tightly through the non return-valvecasing, a ring supported on the ends of the rods and arranged to bearagainst thevalve so as to close it against pressure whenrequired,substantially as described.

3. In combination, a non-return valve, a controlling-motor adapted toclose said valve against pressure, means for holding the valve shutindependently of the controlling-motor comprising studs 1", acooperating crosshead 7 and nut 1 substantially as described.

4. In combination, a non-return valve, a fluidpressure motor adapted toclose said valve against pressure, said valve and motor being bothcapable of independent motion and mounted eoaxially, a dash-potcylinder, a piston in said cylinder, a passage of constricted areaconnecting the ends of said cylinder, substantially as described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

Ilnxnv GRAHAM DAKYNS, Jr., WILLIAM DAGGETT.

controlling-motor arranged coaxially with against pressure, said valveand motorbeing I

